Remove reference to old Inspect.Opts.new

Signed-off-by: José Valim <jose.valim@plataformatec.com.br>

Author: wojtekmach

lib/elixir/lib/inspect.ex

@@ -48,7 +48,7 @@ defprotocol Inspect do
   implementation directly. For example, to test Inspect.MapSet above,
   you can invoke it as:
 
-      Inspect.MapSet.inspect(MapSet.new, Inspect.Opts.new)
+      Inspect.MapSet.inspect(MapSet.new, %Inspect.Opts{})
 
   """